.main{
    position: absolute;
    height: auto;
    bottom: 0;
    top: 0;
    left: 0;
    right: 0;
    margin: 0px;
    z-index: 1;
}

.north{
    position: absolute;
    height: 50px;
    width: auto;
    top: 0;
    left: 0;
    right: 0;
    margin: 0px;
    background-color: green;
    z-index: 1;
    margin: 0;
    padding: 0;
}

.south{
    position: absolute;
    height: 0px;
    width: auto;
    bottom: 0;
    left: 0;
    right: 0;
    margin: 0px;
    background-color: blue;
    z-index: 1;
}

.east{
    position: absolute;
    width: 0px;
    height: auto;
    top: 0px;
    bottom: 0px;
    right: 0;
    margin: 0px;
    background-color: yellow;
    z-index: 1;
}

.west{
    position: absolute;
    width: 0px;
    height: auto;
    top: 0px;
    bottom: 0px;
    left: 0;
    margin: 0px;
    background-color: yellow;
    z-index: 1;
}

.center{
    position: absolute;
    height: auto;
    width: auto;
    top: 50px;
    left: 0px;
    right: 0px;
    bottom: 0px;
    margin: 00px;
    background-color: #999999;
    z-index: 1;
}

